Bilel Chiahoui, 26, was arrested yesterday after posting messages on social media praising those behind the jihadist attacks in Europe and saying he would attack the Tuscan city's famous monument, a huge tourist attraction.
His expulsion order was signed by a judge today according to a police report, which said there was "evidence the Tunisian sympathised with jihadist extremism and IS," a reference to the Islamic State group.
The police statement did not provide details on the target of the suspected attack.
Recent weeks have seen a string of suspected Islamists expelled from the country on the order of Interior Minister Angelino Alfano.
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